Re: Cygwin fails to utilize Unicode replacement character

[Thomas Wolff <towo@towo.net>]

Am 03.09.2018 um 22:27 schrieb Corinna Vinschen:
> On Sep  3 21:14, Corinna Vinschen wrote:
>> On Sep  3 20:20, Thomas Wolff wrote:
>>> Am 03.09.2018 um 19:56 schrieb Thomas Wolff:
>>>> Am 03.09.2018 um 19:16 schrieb Corinna Vinschen:
>>>>> On Sep  3 18:34, Thomas Wolff wrote:
>>>>>> Am 03.09.2018 um 16:59 schrieb Corinna Vinschen:
>>>>>>> Does anybody have an idea what I'm doing wrong?
>>>>>> This works in mintty, just uploaded a patch. Maybe somehow the
>>>>>> GetConsole
>>>>>> "dc" does not support this usage?
>>>>> ¯\_(ツ)_/¯
>>>> Dito; hold on, sorry, your code does *not* work inside mintty.
>>>> Mine looks a bit different and I thought to have manually verified it's
>>>> functionally equivalent, but indeed there must be something fishy...
>>> You still need to
>>>    SelectObject(cdc, f);
>>> where f is the HFONT of the font you want to check.
>>> To compare, you may check out function win_check_glyphs in file wintext.c in
>>> mintty.
>> Thanks but I don't know how to get a HFONT for the current console font.
>>
>> In the meantime I figured out why my GetCurrentConsoleFontEx call
>> failed with error 87:
>>
>> When looking again I realized there's a member called cbSize.  The MSDN
>> docs neglect to tell that the cbSize member has to be primed with
>> sizeof(CONSOLE_FONT_INFOEX).  As soon as I tried that, the function
>> succeeded.
>>
>> Well, it's a start.  I now have the actual font name.  No idea how to
>> get a HFONT from there, though.  From what I can tell ATM, I'd have to
>> call CreateFont to get a new HFONT and then destroy it again after
>> usage.  This looks pretty wasteful.
> Well, it still doesn't work for me.  I now have the following code:
>
> ===================== SNIP ======================
> #include <windows.h>
> #include <stdio.h>
> #include <wchar.h>
>
> int
> main ()
> {
>    static const wchar_t replacement_char[2] =
>      {
>        0xfffd, /* REPLACEMENT CHARACTER */
>        0x2592  /* MEDIUM SHADE */
>      };
>
>    CONSOLE_FONT_INFOEX cfi;
>    HWND cwnd = GetConsoleWindow ();
>    HDC cdc = GetDC (cwnd);
>    int rp_idx = 1;
>    WORD gi[2] = { 0, 0 };
>
>    memset (&cfi, 0, sizeof cfi);
>    cfi.cbSize = sizeof cfi;
>    if (GetCurrentConsoleFontEx (GetStdHandle (STD_OUTPUT_HANDLE), FALSE, &cfi))
>      {
>        printf ("font %ls\n", cfi.FaceName);
>        HFONT hf = CreateFontW (cfi.dwFontSize.Y, cfi.dwFontSize.X,
> 			      0, 0, cfi.FontWeight, FALSE, FALSE, FALSE,
> 			      DEFAULT_CHARSET, OUT_DEFAULT_PRECIS,
> 			      CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY,
> 			      FIXED_PITCH | FF_DONTCARE, cfi.FaceName);
>        if (hf)
>        	{
> 	  HFONT old_f = SelectObject(cdc, hf);
> 	  if (GetGlyphIndicesW (cdc, replacement_char, 2, gi,
> 				GGI_MARK_NONEXISTING_GLYPHS) != GDI_ERROR)
> 	    {
> 	      printf ("gi = %d %d\n", gi[0], gi[1]);
> 	      if (gi[0] != 0xffff)
> 		rp_idx = 0;
> 	    }
> 	  if (old_f)
> 	    old_f = SelectObject (cdc, old_f);
> 	  DeleteObject (hf);
> 	}
>      }
>
>    printf ("rp_idx = %d\n", rp_idx);
>    return 0;
> }
> ===================== SNAP ======================
>
> Supposedly none of the fonts support 0xfffd:
>
>    $ gcc -g -o cons cons.c -lgdi32
>    $ ./cons
>    font Consolas
>    gi = 65535 879
>    rp_idx = 1
>    $ ./cons
>    font Lucida Console
>    gi = 65535 620
>    rp_idx = 1
>    $ ./cons
>    font Courier New
>    gi = 65535 372
>    rp_idx = 1
>
> So I'm still doing something wrong, apparently.  Any hint?
Test with a font that has the glyph; those 3 don't. Try DejaVu.

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